/*
* receive incoming packets from the specified socket, translate their
* addresses to network_address_t type, and call the user-supplied handler
*
* a network interrupt disables interrupts, so that we can cleanly return.
* if interrupts were not disabled, and we were hit by a clock interrupt, it
* would not be possible to return until we returned to the original stack.
* this is inelegant, but we are constrained by ignorance of the minithread
* struct format!
*/
int WINAPI network_poll(void* arg) {
SOCKET* s;
network_interrupt_arg_t* packet;
struct sockaddr_in addr;
int fromlen = sizeof(struct sockaddr_in);
s = (SOCKET *) arg;
for (;;) {
/* we rely on run_user_handler to destroy this data structure */
if (DEBUG)
kprintf("NET:Allocating an incoming packet.\n");
packet =
(network_interrupt_arg_t *) malloc(sizeof(network_interrupt_arg_t));
assert(packet != NULL);
packet->size = recvfrom(*s, packet->buffer, MAX_NETWORK_PKT_SIZE,
0, (struct sockaddr *) &addr, &fromlen);
if (packet->size <= 0) {
if(WSAGetLastError() == 10054){
kprintf("NET: Broadcst attempt rejected (Are all my neighbors running?)\n");
free(packet);
continue;
} else {
kprintf("NET:Error, %d.\n", WSAGetLastError());
AbortOnCondition(1,"Crashing.");
}
}
else if (DEBUG)
kprintf("NET:Received a packet, seqno %ld.\n", ntohl(*((int *) packet->buffer)));
assert(fromlen == sizeof(struct sockaddr_in));
sockaddr_to_network_address(&addr, packet->addr);
/*
* now we have filled in the arg to the network interrupt service routine,
* so we have to get the user's thread to run it.
*/
if (DEBUG)
kprintf("NET:packet arrived.\n");
send_interrupt(NETWORK_INTERRUPT_TYPE, (void*)packet);
}
}
int
network_poll(void* arg)
{
int* s;
network_interrupt_arg_t* packet;
struct sockaddr_in addr;
int fromlen = sizeof(struct sockaddr_in);
s = (int *) arg;
for (;;) {
/* we rely on run_user_handler to destroy this data structure */
if (DEBUG)
kprintf("NET:Allocating an incoming packet.\n");
packet =
(network_interrupt_arg_t *) malloc(sizeof(network_interrupt_arg_t));
assert(packet != NULL);
packet->size = recvfrom(*s, packet->buffer, MAX_NETWORK_PKT_SIZE,
0, (struct sockaddr *) &addr, (socklen_t*) &fromlen);
if (packet->size < 0) {
kprintf("NET:Error, %d.\n", errno);
AbortOnCondition(1,"Crashing.");
} else if (DEBUG)
kprintf("NET:Received a packet, seqno %ld.\n",
(long) ntohl(*((int *) packet->buffer)));
assert(fromlen == sizeof(struct sockaddr_in));
sockaddr_to_network_address(&addr, packet->addr);
/*
* now we have filled in the arg to the network interrupt service routine,
* so we have to get the user's thread to run it.
*/
if (DEBUG)
kprintf("NET:packet arrived.\n");
send_interrupt(NETWORK_INTERRUPT_TYPE, (void*)packet);
}
}
